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#include "qshapedpixmapdndwindow_p.h"

#include <QtGui/QPainter>
#include <QtGui/QCursor>

QT_BEGIN_NAMESPACE

QShapedPixmapWindow::QShapedPixmapWindow()
    : QWindow(),
      m_backingStore(0)
{
    QSurfaceFormat format;
    format.setAlphaBufferSize(8);
    setFormat(format);
    setSurfaceType(RasterSurface);
    setFlags(Qt::ToolTip | Qt::FramelessWindowHint |
                   Qt::X11BypassWindowManagerHint | Qt::WindowTransparentForInput);
    create();
    m_backingStore = new QBackingStore(this);
}

void QShapedPixmapWindow::render()
{
    QRect rect(QPoint(), geometry().size());

    m_backingStore->beginPaint(rect);

    QPaintDevice *device = m_backingStore->paintDevice();

    {
        QPainter p(device);
        p.setCompositionMode(QPainter::CompositionMode_Source);
        p.drawPixmap(0, 0, m_pixmap);
    }

    m_backingStore->endPaint();
    m_backingStore->flush(rect);
}

void QShapedPixmapWindow::setPixmap(const QPixmap &pixmap)
{
    m_pixmap = pixmap;
}

void QShapedPixmapWindow::setHotspot(const QPoint &hotspot)
{
    m_hotSpot = hotspot;
}

void QShapedPixmapWindow::updateGeometry()
{
    QRect rect(QCursor::pos() - m_hotSpot, m_pixmap.size());
    if (m_backingStore->size() != m_pixmap.size())
        m_backingStore->resize(m_pixmap.size());
    setGeometry(rect);
}

void QShapedPixmapWindow::exposeEvent(QExposeEvent *)
{
    render();
}

QT_END_NAMESPACE
